Crisps

Delvis · 23 Oct 2008 at 14:09

It's probably due to life span...I had a bag of crisps in barcelona which where in a see through plastic crisp bag...Still tasted fine though.

But it probably is to do with keeping them fresh for longer...As opposed to just keeping them fresh.

iraiguana · 23 Oct 2008 at 14:40

The foil is a sheet of metal (foil) which is bonded tighter (atoms sit closer together) than polymers (plastics). The plastic relies on long range bonding to form the polymer and is comparable to lots of bits of string bundled and knotted together. Whilst the foil (metal) is closely bonded through metallic bonding and thus has far fewer holes for oxygen/light to pass through.

PhillyDee · 23 Oct 2008 at 15:29

iraiguana said:
The foil is a sheet of metal (foil) which is bonded tighter (atoms sit closer together) than polymers (plastics). The plastic relies on long range bonding to form the polymer and is comparable to lots of bits of string bundled and knotted together. Whilst the foil (metal) is closely bonded through metallic bonding and thus has far fewer holes for oxygen/light to pass through.

Oi! Stop being scientific!

This is GD . . . .

DampCat · 23 Oct 2008 at 15:31

That's exactly what i was after.

Thanks

V4NT0M · 23 Oct 2008 at 15:40

A Bert from Tremors says "Plastic is not an oxygen barrier"

acccc · 23 Oct 2008 at 16:34

iraiguana said:
The foil is a sheet of metal (foil) which is bonded tighter (atoms sit closer together) than polymers (plastics). The plastic relies on long range bonding to form the polymer and is comparable to lots of bits of string bundled and knotted together. Whilst the foil (metal) is closely bonded through metallic bonding and thus has far fewer holes for oxygen/light to pass through.

Epic win.